One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,4)(5,6,9,13)(7,11,15,19)(8,10,16,12)(14,17,20,18)(21,22,24,28)(23,31,33,32)(25,30,26,29)(27,35,36,34)(6,10)(8,16)(11,17)(12,13)(14,20)(18,19)(21,22)(23,32)(24,28)(25,30)(26,29)(27,35)(31,33)(34,36) involution — undirected(2,4)(5,7,9,15)(6,11,13,19)(8,14,16,20)(10,17,12,18)(21,23,24,33)(22,27,28,36)(25,35,26,34)(29,32,30,31)(6,12)(8,16)(10,13)(11,18)(14,20)(17,19)(22,28)(27,36)(29,30)(31,32) 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.