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