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