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