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