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