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