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