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