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