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