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