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