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