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