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