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