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