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