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