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