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