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