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