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)(11,16)(12,14)(13,15)(17,18,23,28)(19,24,32,39)(20,25,34,41)(21,26,22,27)(29,36,31,38)(30,37,44,47)(33,40,35,42)(43,46,45,48)(1,3)(2,5)(4,8)(6,7)(17,19,23,32)(18,24,28,39)(20,30,34,44)(21,31,22,29)(25,37,41,47)(26,38,27,36)(33,43,35,45)(40,46,42,48)(9,11,13,12)(10,14,15,16)(19,29)(21,22)(24,36)(26,27)(30,43)(31,32)(33,35)(37,46)(38,39)(40,42)(44,45)(47,48)(2,6)(5,7)(17,20)(18,25)(19,30)(21,35)(22,33)(23,34)(24,37)(26,42)(27,40)(28,41)(29,43)(31,45)(32,44)(36,46)(38,48)(39,47) involution — undirected(3,8)(5,7)(9,12,13,11)(10,14,15,16)(17,21)(18,26)(20,33)(22,23)(25,40)(27,28)(29,31)(30,44)(34,35)(36,38)(37,47)(41,42)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.