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