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