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