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