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)(15,19)(18,20)(21,22)(23,27)(24,33)(25,32)(26,31)(28,34)(29,35)(30,36)(6,10)(7,12)(14,17)(18,20)(21,23,26,34)(22,27,31,28)(24,32,35,30)(25,29,36,33)(7,12)(8,11)(13,14)(15,18)(16,17)(19,20)(21,23)(22,28)(24,30)(25,33)(26,34)(27,31)(29,36)(32,35) involution — undirected(1,2,3,4)(5,7,9,12)(6,11,10,8)(21,24)(22,29)(23,32)(25,28)(26,35)(27,36)(30,34)(31,33)(5,8,9,11)(6,12,10,7)(13,15)(14,18)(16,19)(17,20)(21,25)(22,30)(23,33)(24,28)(26,36)(27,35)(29,34)(31,32)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.