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