One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,8)(4,9)(5,13)(6,7)(10,14)(11,15)(12,16)(17,18,21,22)(19,23,27,25)(20,28,29,24)(26,31,32,30)(33,34,38,40)(35,41,42,36)(37,45,47,39)(43,44,48,46)(2,7)(3,10)(4,13)(12,15)(17,18)(19,25)(20,24)(21,22)(23,27)(26,31)(28,29)(30,32)(35,42)(36,41)(43,48)(44,46) involution — undirected(2,7)(3,10)(4,13)(12,15)(18,22)(23,25)(24,28)(30,31)(33,35,38,42)(34,36,40,41)(37,43,47,48)(39,44,45,46)(1,3,6,10)(2,8,7,14)(4,11,13,16)(5,12,9,15)(17,18)(19,23)(20,24)(21,22)(25,27)(26,30)(28,29)(31,32)(33,35)(34,36)(37,43)(38,42)(39,44)(40,41)(45,46)(47,48)(1,4,6,13)(2,9,7,5)(3,11,10,16)(8,15,14,12)(17,19,21,27)(18,23,22,25)(20,26,29,32)(24,30,28,31)(33,36)(34,35)(37,46)(38,41)(39,48)(40,42)(43,45)(44,47)(1,5,6,9)(2,4,7,13)(3,12,10,15)(8,11,14,16)(17,20,21,29)(18,24,22,28)(19,26,27,32)(23,30,25,31)(33,37,38,47)(34,39,40,45)(35,43,42,48)(36,44,41,46)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.