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