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