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