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