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