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