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