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