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