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