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