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