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