One vertex per element, one color per generator, with an edge from x to x·s.
(1,2,6,7)(3,4,9,8)(5,10,15,16)(11,12,13,14)(17,18,21,22)(19,25,27,23)(20,24,28,29)(26,31,32,30)(34,39)(35,36)(42,45)(43,44)(2,7)(3,9)(10,16)(11,13)(18,22)(23,25)(24,29)(30,31)(33,34)(35,40)(36,41)(37,42)(38,39)(43,47)(44,48)(45,46) involution — undirected(17,18)(19,23)(20,24)(21,22)(25,27)(26,30)(28,29)(31,32)(33,35,38,36)(34,40,39,41)(37,43,46,44)(42,47,45,48)(1,3,6,9)(2,8,7,4)(5,13,15,11)(10,12,16,14)(17,18)(19,23)(20,24)(21,22)(25,27)(26,30)(28,29)(31,32)(33,34)(35,40)(36,41)(37,45)(38,39)(42,46)(43,48)(44,47)(1,4,6,8)(2,9,7,3)(5,14,15,12)(10,11,16,13)(17,19,21,27)(18,23,22,25)(20,26,28,32)(24,30,29,31)(33,36,38,35)(34,41,39,40)(37,43,46,44)(42,47,45,48)(1,5,6,15)(2,10,7,16)(3,11,9,13)(4,12,8,14)(17,20,21,28)(18,24,22,29)(19,26,27,32)(23,30,25,31)(33,37,38,46)(34,42,39,45)(35,43,36,44)(40,47,41,48)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.