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