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