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