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