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