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