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