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