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