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