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