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