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