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