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