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