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