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