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