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