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