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