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)(17,18,21,20)(19,25,27,23)(22,24,30,29)(26,28,32,31)(1,3,4,8)(2,5,6,7)(17,19)(18,23)(20,25)(21,27)(22,31)(24,32)(26,29)(28,30)(10,13)(14,16)(17,20,21,18)(19,26,27,32)(22,24,30,29)(23,31,25,28)(2,6)(5,7)(19,27)(23,25)(26,32)(28,31) involution — undirected(3,8)(5,7)(9,11,12,15)(10,14,13,16)(19,28)(22,30)(23,26)(24,29)(25,32)(27,31)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.