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