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