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