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