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)(17,18,21,24)(19,26,28,23)(20,29,31,32)(22,27,30,25)(1,3,4,8)(2,5,6,7)(9,11,12,16)(10,13,14,15)(17,19,21,28)(18,23,24,26)(20,25,31,27)(22,29,30,32)(9,10)(11,15,16,13)(12,14)(17,20,30,26,21,31,22,23)(18,19,27,32,24,28,25,29)(2,6)(5,7)(18,24)(19,28)(25,27)(29,32) 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.