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