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