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