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