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