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