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