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)(21,22,27,28,26,31,25,30)(23,24,29,36,32,35,33,34)(7,13)(8,16)(10,17)(11,15)(22,28)(23,32)(24,34)(25,27)(30,31)(35,36) involution — undirected(1,2,3,4)(5,7,9,13)(6,10,12,17)(8,14,16,19)(11,18,15,20)(21,23,26,32)(22,24,31,35)(25,33,27,29)(28,36,30,34)(7,13)(10,17)(14,19)(18,20)(21,24,25,34,26,35,27,36)(22,29,30,23,31,33,28,32)(5,8,9,16)(6,11,12,15)(7,14,13,19)(10,18,17,20)(21,25,26,27)(22,28,31,30)(23,29,32,33)(24,34,35,36)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.