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