One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,7)(4,6)(5,8)(9,10)(11,13)(12,14)(15,16)(17,18,22,21,23,24,32,31)(19,25,28,26,27,30,29,20)(1,3,4,8)(2,5,6,7)(9,10)(11,15)(12,14)(13,16)(17,19,23,27)(18,20,24,26)(21,30,31,25)(22,29,32,28)(2,6)(5,7)(9,11,12,16)(10,13,14,15)(17,20)(18,19)(21,28)(22,25)(23,26)(24,27)(29,31)(30,32)(3,8)(5,7)(11,16)(13,15)(17,21,22,24,23,31,32,18)(19,26,28,30,27,20,29,25)(10,14)(13,15)(19,27)(20,26)(25,30)(28,29) involution — undirectedA 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.