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