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