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