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