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