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