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