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