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