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