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