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