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